MP7680 Exar Corporation, MP7680 Datasheet - Page 9

• Manufacturer Part Number: MP7680
• Description: 5 V Cmos 12-bit Quad Double-buffered Multiplying Digital-to-analog Converter
• Manufacturer: Exar Corporation

like the first one with the difference that B1/B2 = low
An 8-bit bus must use two cycles. The second cycle is
A
DATA
B1/B2
Rev. 3.10
1
WR1
, A
CS
0
A 1
Table 1. DAC Selection
Figure
0
0
1
1
to B1 & B2
High
A 0
0
1
0
1
4. 12 Bit W rite Cycle
Figure
DA11-0
XFER
WR2
I
OUT
SELECTED
6. Transfer
or
DAC
A
C
D
B
t
S
High
Cycles
or
from Input Latches
9
(
low muxes DB11-DB8 to the B2 latches (
Two important notes:
1) Timing diagrams show the inputs CS, A
2) Only 16-bit bus cycles are shown in the next few exam-
Figure 5.
DB11-DB0 to be stable during the entire writing cycle.
In reality all the above signals can change (
as long as they meet the timing conditions specified in
the Electrical Characteristic Table.
ples of interface timing. It is possible to generate an
8-bit interface timing by replacing a single 12-bit write
cycle (
(
DB3-DB0.
Figure 5.
or
A
DATA
B1/B2
1
WR1
) During the second cycle the condition B1/B2 =
, A
Figure 4.
CS
Figure
0
) 8-bit applications should ground inputs
to DAC Latches
5. 8-Bit Double
) with a double 8-bit write cycles
to B1
MP7680
W rite Cycle
to B2
Figure 3.
Figure 4.
1
).
, A
0
)
,